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Unified constraint parameter based on crack-tip opening displacement

机译:基于裂缝开口位移的统一约束参数

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摘要

To develop new fracture assessment methodology to incorporate both in-plane and out-of-plane constraints, it is desirable to develop unified constraint parameters convenient for engineering calculation and application. In this work, a new unified constraint parameterAdbased on crack-tip opening displacement (CTOD) was proposed, and the capability ofAdto characterize both in-plane and out-of-plane constraints has been investigated by a comparison with the unified constraint parameterAp. The results indicate that the parameterAdcan quantify both in-plane and out-of-plane constraints and their change with load levels. A unified correlation line between the normalized fracture toughnessJC/JrefandAd(toughness locus) can be established for both ductile and brittle fracture. The parameterAdbased on CTOD has clear physical and geometric meaning, and it can be easily measured and determined in FEM analyses. Therefore, theAdmay be an appropriate engineering unified constraint parameter, and it may be adopted in fracture assessments of cracked structures for incorporating both in-plane and out-of-plane constraints.
机译:为了开发新的骨折评估方法,以纳入平面内和平面外约束,希望开发方便的工程计算和应用的统一约束参数。在这项工作中,提出了一种新的统一约束在裂缝尖端打开位移(CTOD)上进行了参数,并且已经通过与统一约束参数的比较来研究oadto表征在平面内和面内约束的情况。结果表明,ParameterAdcan量化了平面内和平面外约束及其随负载水平的变化。可以为延性和脆性骨折建立归一化骨折韧度JC / JREFANDAD(韧性基因座)之间的统一相关线。 CTOD上的CommodarAdbased具有明确的物理和几何含义,可以在有限元分析中轻松测量和确定。因此,Theadmay是一个适当的工程统一约束参数,它可以在裂缝结构的断裂评估中采用,以结合平面内和平面外约束。

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